US11242869B2 - Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle - Google Patents
Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle Download PDFInfo
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- US11242869B2 US11242869B2 US16/564,280 US201916564280A US11242869B2 US 11242869 B2 US11242869 B2 US 11242869B2 US 201916564280 A US201916564280 A US 201916564280A US 11242869 B2 US11242869 B2 US 11242869B2
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- solenoid valve
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- actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C15/064—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C2/3446—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
- F04C2/3447—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface the vanes having the form of rollers, slippers or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/02—Pumping installations or systems having reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/20—Filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0096—Heating; Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0427—Heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0402—Cleaning of lubricants, e.g. filters or magnets
- F16H57/0404—Lubricant filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
- F16H61/0009—Hydraulic control units for transmission control, e.g. assembly of valve plates or valve units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K21/00—Fluid-delivery valves, e.g. self-closing valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/029—Electromagnetically actuated valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K49/00—Means in or on valves for heating or cooling
- F16K49/005—Circulation means for a separate heat transfer fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/206—Oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/809—Lubricant sump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/11—Kind or type liquid, i.e. incompressible
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
- F16H2061/126—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the controller
- F16H2061/1264—Hydraulic parts of the controller, e.g. a sticking valve or clogged channel
Definitions
- the invention relates to a pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch actuator or gearbox actuator, with a pump, a storage container for hydraulic fluid and at least one solenoid valve.
- the pump unit serves to provide a hydraulic pressure which is controlled or regulated by activation of the solenoid valve.
- the hydraulic pressure can be used to switch a clutch between an open and a closed position or, in the case of a gearbox actuator, to switch a certain gear stage.
- the solenoid valve is arranged within the storage container and therefore it is surrounded by hydraulic fluid.
- the solenoid valve is very readily protected against environmental influences and corrosion.
- the solenoid valve can be cooled by the hydraulic fluid. In the event of a cold start, the solenoid valve can be used to heat the hydraulic fluid. The positioning of the solenoid valve within the storage container leads to extremely short paths between valve and storage container, thus resulting in good reaction times and a low dynamic pressure loss.
- the solenoid valve preferably has a coil which is surrounded by a housing, wherein a preferably annular free space which is filled with hydraulic fluid is provided between the coil and the housing. This results in an even better transfer of heat between the solenoid valve and the hydraulic fluid if the solenoid valve is not only washed around by hydraulic fluid on the outside, but the coil directly also is too.
- the solenoid valve has a return outlet which leads within the housing. This ensures that the free space is not a “dead volume”, but is always washed through by hydraulic fluid.
- the solenoid valve has an armature, wherein there is a bearing gap between the armature and the coil surrounding the latter, the bearing gap extending over at least 50% of the axial length of the armature, wherein the bearing gap is filled with hydraulic fluid.
- the solenoid valve is preferably a proportional valve, and therefore the hydraulic pressure at the pressure outlet of the pump unit can be controlled very precisely.
- the solenoid valve is preferably attached directly to a pump housing of the pump, thus producing a very compact design with short paths.
- FIG. 1 shows a pump unit in a perspective view
- FIG. 2 shows the pump unit from FIG. 1 in a perspective exploded view
- FIG. 3 shows the pump unit from FIG. 1 in a side view
- FIG. 4 shows the pump unit from FIG. 3 in a first sectional view
- FIG. 5 shows the pump unit from FIG. 3 in a second sectional view
- FIG. 6 shows a hydraulic circuit diagram of the pump unit
- FIG. 7 shows the circuit diagram from FIG. 6 , wherein the hydraulic flow is shown for two different operating states
- FIG. 8 shows the circuit diagram from FIG. 6 , wherein a further operating state is shown
- FIG. 9 shows the circuit diagram from FIG. 6 , wherein the filters used in the pump unit are added;
- FIG. 10 shows a side view of a storage container which is used in the pump unit
- FIG. 11 shows a partial view of an alternative configuration of the storage container
- FIG. 12 shows a schematic illustration of the various volumes within the storage container
- FIG. 13 shows a sectional view of a solenoid valve used in the pump unit
- FIG. 14 shows the solenoid valve from FIG. 13 , wherein the fluid flows during operation have been drawn in;
- FIG. 15 shows a sectional view through the pump unit, wherein a conductor element is shown which is used for transmitting signals between pressure sensors and a printed circuit board;
- FIG. 16 shows the conductor element from FIG. 15 in a perspective view
- FIG. 17 shows the conductor element from FIG. 16 in a longitudinal section
- FIG. 18 shows the conductor element from FIG. 16 in a cross section
- FIG. 19 shows a variant embodiment of the conductor element
- FIG. 20 shows a detail of the contact connection of the pressure sensor
- FIG. 21 shows a cross section through the pump of the pump unit.
- the figures illustrate a pump unit which serves to provide a hydraulic pressure (and also a hydraulic fluid flow) which can be converted by an actuator in the drive train of a motor vehicle into an actuating stroke.
- the actuating stroke can be used to close or open a clutch, for example, or can be used to switch a gear stage of a gearbox or to bring same into the neutral position.
- the pump unit has a drive motor 1 , a pump 2 , an electronic control system 3 , two solenoid valves 4 , two pressure sensors 5 , which are accommodated in a common housing, and a storage container 6 .
- the central component of the pump unit is a pump housing 7 on which the solenoid valves 4 are mounted and on which the storage container 6 is also mounted.
- the pressure sensors 5 are also mounted on the pump housing 7 .
- an electronic housing 8 is mounted on the pump housing 7 , said electronic housing firstly accommodating the electronic control system 3 and secondly containing the stator of the electric motor 1 .
- a cover 9 is mounted on the electronic housing 8 , the cover closing the electronic control system 3 and serving to dissipate the heat lost from the electronic control system 3 to the environment.
- the solenoid valves 2 are arranged within the storage container 6 .
- the electric motor 1 is a brushless electric motor with which the pump 2 is driven.
- the pump 2 is a rotary vane pump (see FIG. 21 ) which has a rotor 10 with a plurality of chambers 12 , in each of which a rotary vane element 14 is arranged.
- the rotary vane elements 14 are cylindrical rollers.
- the pump is therefore a roller vane pump.
- each rotary vane element passes twice through a sequence of intake region A and pressure region D. Accordingly, the pump has two suction connections and two pressure outlets.
- the pump unit likewise has two pressure outlets 20 which are independent of each other.
- the pump is constructed symmetrically by all the components which will be explained below being present for each pressure outlet.
- the solenoid valve is described below, this applies to the two solenoid valves since one is present for each pressure outlet.
- the pump unit has two pressure outlets 20 via which the hydraulic pressure is provided which is produced by the pump unit for actuating the actuator.
- a nonreturn valve 22 is arranged downstream of each pressure outlet D of the pump 2 .
- the nonreturn valves 22 have a valve seat made of rubber.
- the inlet 24 of the solenoid valve 4 is located downstream of the outlet of the nonreturn valve 22 .
- each of the solenoid valves 4 is activated in such a manner that the desired hydraulic pressure is present at the pressure outlet 20 of the pump unit. Excess hydraulic fluid is conducted back directly into the storage container 6 by a return line 26 .
- the solenoid valves 4 are designed as proportional valves and, as valve element, have a ball which, together with the valve seat, ensures that the solenoid valve 4 is free from leakage in the closed state.
- FIG. 7 shows the fluid flow in a state in which hydraulic pressure is not intended to be provided at the right pressure outlet 20 .
- FIG. 7 shows the state in which a regulated hydraulic pressure is provided at the pressure outlet 20 of the pump unit.
- the solenoid valve 4 is activated by the electronic control system 3 in such a manner that the actual pressure corresponds to the desired pressure.
- FIG. 8 shows the pump unit in a state in which the pump 2 has been stopped.
- the solenoid valve 4 on the right side is open, and therefore the right pressure outlet 20 is free from pressure.
- An essential feature of the concept for keeping impurities away from the pump unit is that no suction-side filters are used; all of the filters are arranged on the pressure side. Accordingly, the pump sucks up directly from the storage container 6 .
- a first filter 30 is located downstream of the corresponding pressure outlet of the pump 2 . Said filter serves to filter out impurities from the hydraulic fluid before said impurities pass to the solenoid valve 4 . Since a large portion of the hydraulic fluid is conducted by the pump 2 to the solenoid valve 4 and from there via the return line 26 to the storage container 6 , the two filters 30 ensure that impurities are continuously filtered out from the hydraulic fluid because of the inner circulation of the hydraulic fluid.
- a second filter 32 is provided downstream of the solenoid valve 4 , but still upstream of the pressure outlet 20 . Said filter prevents impurities from being able to be introduced into the pump unit. Said impurities are in particular original soilings of the lines and of the actuator and abrasion from the actuator, to which the hydraulic fluid is provided by the pump unit.
- the filters 30 , 32 are configured to be effective throughout the entire service life of the pump unit without having to be cleaned or replaced.
- they have a cross section of the order of magnitude of 65 mm 2 .
- Their mesh width is of the order of magnitude of 0.1 mm.
- the storage container 6 is provided with a filling filter 34 which is arranged in such a manner that any hydraulic fluid which is filled into the storage container 6 via a filling opening 33 has to flow through the filling filter 34 .
- the filling filter 34 has a mesh width of the order of magnitude of 0.3 mm, wherein the material of which said filling filter is composed has a diameter of the order of magnitude of 0.2 mm.
- the filling filter 34 ensures that no impurities are introduced into the storage container 6 from the outside.
- the storage container 6 is divided into two chambers 40 , 42 , wherein an intake opening 44 leading to the suction connection A of the pump 2 is arranged in each chamber 40 , 42 .
- a driver after receiving a warning about the failure of the first hydraulic circuit, can still safely drive the vehicle into a parking bay or into a parking space since, for example in the case of a dual clutch gearbox, a clutch and the gearbox switching stages associated therewith are still ready for operation.
- a substantially horizontally extending partition 46 which has a vertically extending end wall 48 (see FIG. 10 ), or a substantially vertically extending partition 50 (see FIG. 11 ).
- Each chamber 40 , 42 has a dead volume T which corresponds to the volume below the corresponding intake opening 44 .
- a working volume W is located above the dead volume. Said working volume W is determined by the uppermost edge of the end wall 48 or of the partition 50 .
- a common working volume GW is located above the working volumes W.
- the hydraulic circuits are separated from one another whenever the common working volume GW drops to zero and each hydraulic circuit only still sucks up from its own working volume W.
- the solenoid valves 4 are arranged within the storage container 6 .
- a solenoid valve is in each case arranged here in a chamber 40 , 42 .
- Each of the solenoid valves 4 has a housing 60 (see FIG. 13 ) which surrounds the components of the solenoid valve 4 .
- the solenoid valve 4 has a nonreturn valve 62 , a valve seat 64 , a valve element 66 , an armature 68 and a coil 70 .
- the hydraulic fluid flows via an intake 72 (see FIG. 14 ) either to the pressure outlet 20 of the pump unit or via the opening cross section between the valve seat 64 and the valve element 66 to the return line 26 .
- a particular feature consists in that the route to the return line 26 leads through the interior of the housing 60 .
- a corresponding return output 67 of the solenoid valve is symbolized in FIG. 14 by the vertically downwardly pointing arrow, the return output beginning behind the valve seat and leading into the space within the housing 60 .
- the nonreturn valve 62 which is integrated here in the solenoid valve 4 corresponds to the nonreturn valve 22 shown in FIGS. 6 to 9 .
- a further particular feature consists in that a bearing gap which is present between the armature 68 and a bearing 76 inserted into the coil 70 and the solenoid valve housing is likewise flushed through with hydraulic fluid.
- a further particular feature of the solenoid valve 4 consists in that it is self-cleaning since the path to the return line 26 removes any particles from the open valve seat and the valve element.
- each conductor element 80 contains three electric conductors which are composed, for example, of spring bronze.
- the conductors 82 are encased, in particular insert moulded, with plastic, such that the conductor element 80 is formed.
- the conductors 82 are bent over by barely 180° on their side facing the pressure sensor 5 such that spring contacts 86 are formed.
- the latter serve to lie in a spring-elastic manner against corresponding connection contacts with the pressure sensors and thereby to produce an electrical contact (see FIG. 20 ).
- the pressure sensor 5 is sealed on the side facing away from the conductor element 80 by means of various seals 114 .
- the electric conductors 82 are designed as contact pins 88 which can be inserted into a plug on a printed circuit board 90 on which the electronic control system 3 is constructed.
- the conductor element 80 extends from the printed circuit board 90 through a leadthrough 92 in the electronic housing 8 and into a receptacle 94 in the pump housing 7 .
- the conductor element 80 is sealed both in relation to the leadthrough 92 and in relation to the receptacle 94 .
- two seals 96 , 98 are provided which provide a seal within the leadthrough 92
- a seal 100 is provided which provides a seal in relation to the receptacle 94 .
- the seals 96 , 98 , 100 are 0 rings which are accommodated in corresponding receiving grooves 102 , 104 , 106 which are provided on the conductor element 80 .
- the conductor element 80 is provided with a channel 110 which extends along the longitudinal direction of the conductor element 80 , specifically leading from the side which is arranged in the receptacle 94 , i.e. the side assigned to the pressure sensors 5 , and into a recess 112 between the seals 96 and 98 , i.e. within the leadthrough 92 .
- the channel 110 serves to check with little outlay whether the two conductor elements 80 are correctly mounted, in particular whether the seals 96 , 98 , 100 are providing a seal in the desired manner.
- the test takes place by a negative pressure being applied in the region of the pressure sensors. After a short settling time, it can be measured whether the applied negative pressure remains constant or whether the pressure rises.
- the pressure remains constant, this means that all of the seals are providing a seal in the desired manner. If the negative pressure becomes lower, this means that at least one of the seals is not correctly providing a seal. This can either be the seal 96 , and therefore air is sucked out of the region of the printed circuit board 90 into the leadthrough 92 and via the recess 112 into the channel 110 . It can also mean that the seal 98 is not providing a seal, and therefore ambient air is sucked out of the region between the leadthrough 92 and the receptacle 94 towards the recess 112 . Finally, it can mean that the seal 100 is not providing a seal, and therefore ambient air is sucked through the receptacle 94 towards the region of the pressure sensors 5 .
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Thermal Sciences (AREA)
- Control Of Transmission Device (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Magnetically Actuated Valves (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018122305.6A DE102018122305A1 (en) | 2018-09-12 | 2018-09-12 | Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle |
DE102018122305.6 | 2018-09-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20200080573A1 US20200080573A1 (en) | 2020-03-12 |
US11242869B2 true US11242869B2 (en) | 2022-02-08 |
Family
ID=67850970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/564,280 Active US11242869B2 (en) | 2018-09-12 | 2019-09-09 | Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle |
Country Status (5)
Country | Link |
---|---|
US (1) | US11242869B2 (en) |
EP (1) | EP3623620B1 (en) |
KR (1) | KR102611431B1 (en) |
CN (1) | CN110894874B (en) |
DE (1) | DE102018122305A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4124782B1 (en) * | 2021-07-28 | 2024-02-21 | ZF CV Systems Europe BV | An assembly for actuating a vehicle transmission |
Citations (7)
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---|---|---|---|---|
US4639704A (en) | 1986-03-03 | 1987-01-27 | Bicron Electronics Company | Debris tolerant solenoid |
DE102006030141A1 (en) | 2006-06-29 | 2008-01-03 | Zf Friedrichshafen Ag | Pressure supply unit for hydraulic systems comprises electric motor which feeds fluid to two cylinders via pipes fitted with non-return valves, cylinders also being fitted with return flow pipes each of which also has non-return valve |
EP2532914A1 (en) | 2011-06-07 | 2012-12-12 | FTE automotive GmbH | Hydraulic actuation device for actuating clutches, particularly in a multi-clutch transmission system for motor vehicles |
US20130164163A1 (en) | 2011-12-21 | 2013-06-27 | Hitachi Automotive Systems, Ltd. | Variable displacement pump |
US20140169997A1 (en) * | 2012-12-19 | 2014-06-19 | Bucher Hydraulics S.P.A. | Power unit to move at least a hydraulic actuator |
US20150179326A1 (en) * | 2013-05-28 | 2015-06-25 | Kawasaki Jukogyo Kabushiki Kaisha | Oil-immersed solenoid |
US20150279538A1 (en) * | 2014-03-28 | 2015-10-01 | Denso Corporation | Solenoid and hydraulic pressure control apparatus having the same |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014001073A1 (en) * | 2014-01-30 | 2015-07-30 | Fte Automotive Gmbh | Device for the hydraulic actuation of a motor vehicle friction clutch |
-
2018
- 2018-09-12 DE DE102018122305.6A patent/DE102018122305A1/en not_active Withdrawn
-
2019
- 2019-08-30 CN CN201910812593.4A patent/CN110894874B/en active Active
- 2019-09-03 EP EP19195232.4A patent/EP3623620B1/en active Active
- 2019-09-06 KR KR1020190111016A patent/KR102611431B1/en active IP Right Grant
- 2019-09-09 US US16/564,280 patent/US11242869B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4639704A (en) | 1986-03-03 | 1987-01-27 | Bicron Electronics Company | Debris tolerant solenoid |
DE102006030141A1 (en) | 2006-06-29 | 2008-01-03 | Zf Friedrichshafen Ag | Pressure supply unit for hydraulic systems comprises electric motor which feeds fluid to two cylinders via pipes fitted with non-return valves, cylinders also being fitted with return flow pipes each of which also has non-return valve |
EP2532914A1 (en) | 2011-06-07 | 2012-12-12 | FTE automotive GmbH | Hydraulic actuation device for actuating clutches, particularly in a multi-clutch transmission system for motor vehicles |
US20120312655A1 (en) | 2011-06-07 | 2012-12-13 | Fte Automotive Gmbh | Hydraulic Actuating Device for Actuation Of Clutches In, In Particular, A Multi-Clutch Transmission For Motor Vehicles |
US20130164163A1 (en) | 2011-12-21 | 2013-06-27 | Hitachi Automotive Systems, Ltd. | Variable displacement pump |
US20140169997A1 (en) * | 2012-12-19 | 2014-06-19 | Bucher Hydraulics S.P.A. | Power unit to move at least a hydraulic actuator |
US20150179326A1 (en) * | 2013-05-28 | 2015-06-25 | Kawasaki Jukogyo Kabushiki Kaisha | Oil-immersed solenoid |
US20150279538A1 (en) * | 2014-03-28 | 2015-10-01 | Denso Corporation | Solenoid and hydraulic pressure control apparatus having the same |
Non-Patent Citations (2)
Title |
---|
Extended European Search Report dated Jan. 20, 2020, in Patent Application No. 19195232.4, citing documents AA-AC and AO therein, 7 pages. |
German Search Report dated Apr. 30, 2019 in German Application No. 10 2018 122 305.6 filed on Sep. 12, 2018 (with English Translation of Categories of Cited Documents & Written Opinion). |
Also Published As
Publication number | Publication date |
---|---|
EP3623620B1 (en) | 2021-08-18 |
KR102611431B1 (en) | 2023-12-08 |
EP3623620A1 (en) | 2020-03-18 |
DE102018122305A1 (en) | 2020-03-12 |
US20200080573A1 (en) | 2020-03-12 |
CN110894874A (en) | 2020-03-20 |
KR20200030459A (en) | 2020-03-20 |
CN110894874B (en) | 2022-10-21 |
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